Post by c128dcr on Feb 20, 2017 1:47:45 GMT
Hello. I have a original 256 KB 1764 REU.
I want expand to 512 KB, but I do not have 8× 41256 RAM chips. 1×41256 = 256 KB×1 bit, 8×41256 = 256 KB×8 bit.
I have 2×44256 RAM chips. 1 chip = 256 KB×4 bit, 2 chip = 256 KB×8 bit. 2 chips soldering plainer, than 8 chips.
If I installed 2×44256, then 512 KB OK? Not pin compatible.
41256 pinout: pdf1.alldatasheet.com/datasheet-pdf/view/37259/SAMSUNG/KM41256A.html
44256 pinout: pdf1.alldatasheet.com/datasheet-pdf/view/125857/SAMSUNG/KM44C256A.html
I want expand to 512 KB, but I do not have 8× 41256 RAM chips. 1×41256 = 256 KB×1 bit, 8×41256 = 256 KB×8 bit.
I have 2×44256 RAM chips. 1 chip = 256 KB×4 bit, 2 chip = 256 KB×8 bit. 2 chips soldering plainer, than 8 chips.
If I installed 2×44256, then 512 KB OK? Not pin compatible.
41256 pinout: pdf1.alldatasheet.com/datasheet-pdf/view/37259/SAMSUNG/KM41256A.html
44256 pinout: pdf1.alldatasheet.com/datasheet-pdf/view/125857/SAMSUNG/KM44C256A.html